EP0066654A1 - Circuit pour centraux de télécommunication à multiplexage temporel, en particulier des centraux téléphoniques MIC à commande centralisée, avec un réseau de commutation, avec des circuits d'interface, avec une unité de commande centrale et avec des unités de commande décentralisées ajoutées aux circuits d'interface - Google Patents

Circuit pour centraux de télécommunication à multiplexage temporel, en particulier des centraux téléphoniques MIC à commande centralisée, avec un réseau de commutation, avec des circuits d'interface, avec une unité de commande centrale et avec des unités de commande décentralisées ajoutées aux circuits d'interface Download PDF

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Publication number
EP0066654A1
EP0066654A1 EP81109270A EP81109270A EP0066654A1 EP 0066654 A1 EP0066654 A1 EP 0066654A1 EP 81109270 A EP81109270 A EP 81109270A EP 81109270 A EP81109270 A EP 81109270A EP 0066654 A1 EP0066654 A1 EP 0066654A1
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EP
European Patent Office
Prior art keywords
connection
switching
line
time
division multiplex
Prior art date
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Granted
Application number
EP81109270A
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German (de)
English (en)
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EP0066654B1 (fr
Inventor
Karlheinz Neufang
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Siemens AG
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Siemens AG
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Priority to AT81109270T priority Critical patent/ATE13238T1/de
Publication of EP0066654A1 publication Critical patent/EP0066654A1/fr
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Publication of EP0066654B1 publication Critical patent/EP0066654B1/fr
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0407—Selecting arrangements for multiplex systems for time-division multiplexing using a stored programme control

Definitions

  • switching indicators are used to control switching processes.
  • DE-PS 19 1 0 974 already deals with the problem of the transmission of such switching indicators in time-division multiplex telecommunications systems.
  • Such switching indicators usually appear in a conventional telecommunications system, in particular a telephone exchange, on their individual lines as pulse-shaped or longer-lasting DC signals in such a way that the individual line cores (a, b, if applicable, c) of such a line have certain potentials in various combinations; two possible potential states are provided for each wire.
  • number dialing switching codes are forwarded via the a wire in such a way that earth potential is applied to the a wire in the rhythm of the number switch pulses; the so-called closing sign, which is generated in the exchange when a called subscriber hangs up the handset at the end of the call, appears in the form "voltage on b-wire and earth on a-wire".
  • the switching indicators may be converted into a form of representation suitable for such a transfer.
  • Time-division multiplex telecommunications systems have also become increasingly interesting, i.e. Telecommunication systems in which the sequences of information to be transmitted between the individual end or intermediate transmission points, which may be connected to each other from case to case, are modulated, which are staggered in time and can therefore be bundled in time by nesting on time-division multiplex lines, in which case then the individual transmission channels are separated in time (time channels).
  • the invention is based on time-division multiplex telecommunications systems. It relates to the transmission of the shift indicator. Such a switching indicator transmission can generally take place in time elements of the time slots of the time channel provided for the respective connection (connection time channel), or in a data reserved for this purpose in the pulse frame of the PCM system and common to all connection time channels. Time channel.
  • the invention is based on a shift indicator transmission of the latter type.
  • a shift indicator control unit is known from GB-PS 10 40 833, which is provided for the recording and subsequent reproduction of such shift indicators.
  • control unit loading can block the switching indicator control unit for processing operations to be carried out by it, so that such control units perform their own task of recording switching signals intended for the switching center concerned and processing them themselves or by the switching center generating and releasing outgoing switching indicators are withdrawn with respect to part of their working capacity. They can therefore not fulfill their actual task uninfluenced by switching indicators that are only to be transmitted via the relevant switching center, but are subject to an additional burden due to the switching indicator being passed on.
  • a circuit arrangement is known from the German patent cited at the beginning, both of which signaling signals are conveyed via a signal switching field provided in addition to a connecting switching matrix in order to relieve such switching marking control mechanisms.
  • the signaling characters transmitted in a common signal channel are accompanied in each case by a time channel designation which indicates the assignment to a specific time channel for each signaling character.
  • this time channel designation is decisive for the correct forwarding of the signaling characters.
  • shift registers, comparators, channel designation generators and the like are required both on the input side and on the output side, which not only represent a special outlay but also necessitate the handling of a relatively complicated method which deviates from the switching of the message channels.
  • the invention relates to a circuit arrangement for centrally controlled time-division multiplex telecommunication switching systems, in particular PCM telephone switching systems, with a multi-stage switching matrix having time-division multiplex inputs and time-division multiplex outputs, and with a plurality of one connection of time-division multiplex connecting lines, analog connecting lines and / or Connection devices serving analog subscriber lines, each of which is connected to a time-division multiplex input and a time-division multiplex output of the switching matrix, and with at least one central control unit and several decentralized control units individually assigned to the connection units, which are connected to the control unit via data channels, and with units for Transmission of switching indicators to be passed on via analog connecting lines, in particular of charge counting pulses, which are transmitted as direct current signals and / or simultaneously with the communication paths, for example Speech circuits, and just as they are transmitted through current paths for a connection, and which, in the case of connections running via the switching matrix and an analog connecting line in each case, are fed to the decentralized control device
  • the object of the invention is to provide simpler options than those known hitherto for transferring a shift indicator.
  • the decisive factor here is that the effort for switching matrixes in time-division multiplex telecommunication switching systems could be gradually reduced considerably, namely by standardizing the time slot multiples and space layer multiples used and that the load more centrally Control units and decentralized control devices represent a problem that can be effectively countered, in particular from the point of view of the transmission of the switching indicator.
  • the invention achieves the object set by the fact that when connections are established from a subscriber line - or connecting line - via the switching matrix and in each case an analog connecting line, and a connection-specific switching device assigned to this, e.g. Line termination circuit, apart from a first time-division multiplex connection path via the switching matrix between the subscriber line - or connecting line - and the connection-specific switching device, which serves as a message transmission path via the switching matrix, regardless of this and additionally from the decentralized control device of the line group to which the relevant subscriber line - or connecting line - belongs, for the same connection-specific switching device, a second time-division multiplex connection path is switched through via the switching matrix, which serves to transmit the switching indicators.
  • a connection-specific switching device assigned to this, e.g. Line termination circuit, apart from a first time-division multiplex connection path via the switching matrix between the subscriber line - or connecting line - and the connection-specific switching device, which serves as a message transmission path via the switching matrix,
  • the invention which assumes that the effort for switching matrixes in time-division multiplex telecommunication switching systems is relatively low, but that the load on central control devices and also on the decentralized control units is a problem which, due to the use of the processes which are inadequate in terms of their intended use, is a problem Switching license plate transmission is significantly tightened, now creates the possibility of significantly reducing the load on the central control device with a somewhat greater use of the switching network, and also significantly reducing the load on the decentralized control units bet by only having to cooperate with so-called exit connections with billing instead of two such control units; Exit connections are those which continue from a time-division multiplex telecommunication switching system into a space-multiplex telecommunication switching system, the latter generating charge counts and transmitting them backwards via the established connection path, and recording them in the time-multiplexing telecommunication switching system and processing them with regard to the calling subscriber in each case .
  • a switching matrix K constructed in three switching stages RZE, R and RZA has a larger number of switching matrix connections on the input side, one of which is shown and labeled A.
  • Such a switching matrix connection always comprises a pair of time-division multiplex lines, of which one time-division multiplex line is used for signal transmission to the switching matrix and the other time-division multiplexing line is used for signal transmission from the switching matrix.
  • the switching matrix connection A comprises a time-division multiplex line A1 and a time-division multiplex line A2.
  • the respective signal transmission device is indicated by corresponding arrows for each of these two time-division multiplex lines.
  • the coupling multiples of the first coupling stage RZE are combined time-space multiples, as can be seen from the symbols shown.
  • the coupling multiples of the middle coupling stage R are spatial position multiples.
  • the coupling multiple of the last coupling stage RZA are space-time-multiples again.
  • a larger number of the specified multiples is provided in each coupling stage, although only three multiples of the specified type are shown for each coupling stage.
  • the coupling multiples of the different coupling stages are connected to one another via intermediate lines in the manner shown in the drawing. These links are time-division links.
  • the switching network connections are also time-multiplexed.
  • connection groups e.g. the connection group LTG1 (Line Trunk Group) individually connected.
  • Such a connection group can be connected on the input side with subscriber lines (analog), analog connection lines and with PCM connection lines (alternatively or in combination).
  • a subscriber station connected via a subscriber line is designated T1.
  • a line group includes encoders, decoders, multiplexers, demultiplexers and the facilities required to implement the so-called BORSCHT functions (cf. NTZ Vol. 33/1980, No.
  • connection group LTG1 is shown in the drawing. Their structure and mode of operation are described in detail in DT-OS 28 26 113 from page 6 below. The further explanations set this Description as known in advance and are limited to the relationships that are particularly important in the present case.
  • connection groups are devices (LTG) which are individually connected to the connections of the multi-level switching matrix K, in which the two channels to be switched over via the switching matrix according to the time-division multiplex principle and belonging to one connection in each case by means of intermediate storage of the message information to be transmitted in each of the two transmission directions have synchronicity with regard to the timing and pulse frame limits.
  • the PCM information is stored per connection in connection with the coding and decoding mentioned and with the multiplexers and demultiplexers.
  • compensation memories can also be provided in the connection groups for frame compensation with regard to the information transmission via these PCM connecting lines. In them, therefore, all of the previously mentioned switching means required for connecting the above-mentioned lines or only those required for the respective function can be provided in each case.
  • a central control unit ZW serves, among other things, to establish the communication links to be set up via the switching matrix K. It determines the switching data required to establish each connection. As is generally known, the switching data for a connection to be switched through specifies exactly the course of the connection in question via the switching matrix, that is to say the switching matrixes and intermediate lines traversed by the connection, and the channels occupied therein.
  • Mediation data is collected with the help of the central control unit, i.e. also performs the function of a route search device and occupancy memory, elaborates and transmits it to the switching matrix setting device KE of the switching matrix K.
  • the data flow which transmits the switching data from the central control unit ZW to the switching matrix setting device KE runs via a buffer device MB which is connected to the central control unit via a central data line D and is used for intermediate storage and recoding of data and for adaptation of the transmission speeds.
  • the buffer device can be limited to a part of these functions or to only one of these functions at a time. Such a buffer device is e.g. in DE-PS 15 37 849 (VPA 67/3047) described in detail.
  • a larger number of decentralized control devices TE1 to TEn are shown, each of which is individually assigned to the connection groups LTG1 to LTGn. These control devices are used to carry out all switching operations within each of the connection groups mentioned. These switching processes include in particular all switching processes within these line groups. Further details on this can be found in the previously mentioned DE-OS 28 26 113.
  • the decentralized control devices TE1 to TEn are connected to the central control unit ZW via data channels which are switched through individually per decentralized control device via the switching matrix K to the buffer device MB.
  • a separate data channel leads from this buffer device, namely from its data header ML, to each of the decentralized control devices.
  • the buffer device is MB with its data header ML connected to one of the switching matrix connections K via a time-division multiplex line m.
  • the buffer device is connected to one of the switching matrix connections of the switching matrix K in the same way as each of the connection groups LTG1 to LTGn mentioned.
  • the time-division multiplex line m is therefore connected to a switching matrix connection, which comprises a time-division multiplex input to a space-position multiple of the first coupling stage and a time-division multiplex output from a space-multiple of the last coupling stage.
  • the time-division multiplex line m is therefore connected to a switching matrix connection such as that designated by A.
  • Each data connection between the header ML of the buffer device MB and each of the line groups, e.g. the connection group LTG1, comprises a channel for the transmission of data from the buffer device to the relevant connection group and a further channel for the transmission of data in the opposite direction.
  • These two data channels lead to and from the decentralized control device individually assigned to the relevant line group.
  • the establishment and maintenance of the explained data connections via the switching matrix K is carried out with the aid of the switching matrix setting device KE in the same way as the establishment and maintenance of communication links, for example telephone connections.
  • the switching matrixes of the switching matrix K are assigned latches, into which the switching data relating to a switching matrix are stored. With the help of this latch ensures that the required interconnections are available in the respective time slots or that the required write operations and read operations for the full memories of the time slot multiples take place. All further details relating to the structure and mode of operation of a time-division multiplex switching arrangement are assumed to be known here and are therefore not described in further detail.
  • the switching data required for establishing message connections are transmitted from the central control unit via the buffer device MB to the switching matrix setting device KE.
  • a data header MK which is assigned to the buffer device MB.
  • a plurality of switching matrix setting devices KE can also be connected to a buffer device MB.
  • These multiple switching matrix setting devices can be individually assigned to several switching matrix parts of a larger switching matrix. It is also possible to provide a switching matrix setting device for each switching stage.
  • the switching matrix setting device KE is also in one their assigned memory V contains setting data, that is to say the switching data, stored for the data channels.
  • this switching data does not therefore have to be reworked by the central control unit ZW and does not have to be retransmitted via the buffer device MB. If the data connections required between the buffer device MB and the connection groups LTG1 to LTGn, ie their decentralized control devices TE1 to TEn, are newly established via the switching matrix K, the central control unit ZW only issues a corresponding command to the buffer device MB, which they send to the Coupling field setting device KE passes on, and on the basis of which this takes the switching data stored in its memory V in order to carry out the necessary switching processes one after the other in a manner known per se.
  • the time channel coupler TSU of the connection group LTG1 in addition to communication connections from and to subscriber stations and connecting lines, also connects the data connections already mentioned between the connection groups, e.g. LTG1, assigned decentralized control devices, e.g. GP, on the one hand and the central control unit ZW on the other hand. As already explained, these data connections continue to run over the switching matrix K and the time-division multiplex line m.
  • connection lines (analog
  • connection lines and / or time-division multiplex connection lines connected.
  • the connection groups LTG2 and others up to LTGn are designed in the same way as the connection group LTG1.
  • the decentralized control devices GP cooperate in the recording and delivery of switching indicators with regard to the connected subscriber lines and connecting lines. Data corresponding to these switching indicators is formed in the case of switching indicators to be recorded via a subscriber line and / or connecting line and is transmitted to the central control unit. For switching codes to be sent out via subscriber lines and / or connecting lines, the central control unit supplies corresponding data to the relevant decentralized control device, which then manages the formation and transmission of the relevant switching code.
  • connection line Vx is connected to the connection group LTG2 via a line termination circuit Vz.
  • This is an analog connection line. It leads to a conventional telephone exchange.
  • switching indicators are transmitted in the form of direct current pulses in conventional telephone switching systems. This can be the start sign, the end sign, charge counts, the end of election sign and the like.
  • the structure and mode of operation of conventional telephone exchanges are described in great detail. the as DC signals and / or via at the same time with the communication paths, e.g. speech circuits and just like these, for a connection, through-connected current paths are transmitted (four-wire EMD technology).
  • a subscriber line e.g. the subscriber line assigned to the subscriber station T1
  • an analog connecting line e.g. Vx
  • a connection-specific switching device e.g. Vz
  • a second time-division multiplex connection path is switched through the switching matrix K, which is used to transmit the switching indicators .
  • two time-division multiplex connections are thus established via the switching matrix K.
  • One serves as a message connection path from the subscriber station T1 to one via the analog connecting line Vx selected second subscriber station, not shown; the other of these two time-division multiplex connections switched through the switching matrix K runs from the decentralized control device GP of the connection group LTG1, to which the calling subscriber is connected, via the time-channel coupler TSU to the line termination circuit Vz.
  • This second time-division multiplex connection is used to switch all circuit indicators between the line termination circuit Vz and the decentralized control device GP exchanged. In addition to charge counts, these can also be switching indicators of any other type.
  • the second time-division multiplex connection path is switched through independently of the first and in the same way as this via the switching matrix K.
  • the decentralized control device GP ... in each of the LTG ... connection groups serves to identify and record switching indicators that arrive via connected subscriber lines and / or connecting lines and to pass them on to the central control unit ZW. These switching indicators are used both for establishing connections via the switching matrix K and for forwarding in the case of exit connections in the manner described above.
  • the central control unit ZW partly processes such switching indicators itself, e.g. by handling the control of the connection establishment via the switching matrix K with the help of the switching matrix setting device KE.
  • the second time-division multiplex connection path that is also built up when a connection is set up via the switching matrix K and an analog connecting line Vx can not only be used to transmit data with the aid of which counting pulses are signaled. But it can also switch indicators data corresponding to any other type are transmitted via this second time-division multiplex connection path. It is provided that when a connection is set up via the switching matrix K and an analog connecting line, dialing indicators are transmitted via the message connection path by the decentralized control device assigned to the subscriber line corresponding to the calling subscriber line, and after the start of the call, all switching indicators are transmitted via the second time-division multiplex connection path.
  • the message connection path thus serves to pass such data from the decentralized control device GP to the line termination circuit Vz of the analog connecting line Vx, which signal dialing indicators which are to be transmitted via the analog connecting line Vx and are used in a conventional telephone switching system for further connection establishment up to the person to be called Participants are provided. Only from the beginning of the conversation is the second time-division multiplex connection path switched through the switching matrix K used for the transmission of all further switching indicators.
  • the so-called start signal indicating the beginning of a call connection is signaled both via the message connection path and via the second time-division multiplex connection path. For this purpose, corresponding data are transmitted over the switching network via the two paths.
  • the start signal On the Message connection path is thus signaled as the last switching indicator, the start signal, which is signaled as the first switching indicator via the second time-division multiplex connection path.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
EP81109270A 1981-06-04 1981-10-29 Circuit pour centraux de télécommunication à multiplexage temporel, en particulier des centraux téléphoniques MIC à commande centralisée, avec un réseau de commutation, avec des circuits d'interface, avec une unité de commande centrale et avec des unités de commande décentralisées ajoutées aux circuits d'interface Expired EP0066654B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109270T ATE13238T1 (de) 1981-06-04 1981-10-29 Schaltungsanordnung fuer zentralgesteuerte zeitmultiplex-fernmeldevermittlungsanlagen, insbesondere pcm-fernsprechvermittlungsanlagen, mit einem koppelfeld, mit anschlusseinrichtungen und mit einem zentralen steuerwerk und den anschlussgruppen zugeordneten dezentralen steuereinrichtungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3122172 1981-06-04
DE19813122172 DE3122172A1 (de) 1981-06-04 1981-06-04 Schaltungsanordnung fuer zentralgesteuerte zeitmultiplex-fernmeldevermittlungsanlagen, insbesondere pcm-fernsprechvermittlungsanlagen, mit einem koppelfeld, mit anschlusseinrichtungen und mit einem zentralen steuerwerk und den anschlusseinrichtungen zugeordneten dezentralen steuereinrichtungen

Publications (2)

Publication Number Publication Date
EP0066654A1 true EP0066654A1 (fr) 1982-12-15
EP0066654B1 EP0066654B1 (fr) 1985-05-08

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EP81109270A Expired EP0066654B1 (fr) 1981-06-04 1981-10-29 Circuit pour centraux de télécommunication à multiplexage temporel, en particulier des centraux téléphoniques MIC à commande centralisée, avec un réseau de commutation, avec des circuits d'interface, avec une unité de commande centrale et avec des unités de commande décentralisées ajoutées aux circuits d'interface

Country Status (6)

Country Link
EP (1) EP0066654B1 (fr)
JP (1) JPS57211897A (fr)
AR (1) AR230913A1 (fr)
AT (1) ATE13238T1 (fr)
BR (1) BR8203248A (fr)
DE (1) DE3122172A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209954C2 (de) * 1982-03-18 1986-09-18 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für Fernmeldeanlagen, insbesondere Fernsprechvermittlungsanlagen, mit Schaltmitteln zur Signalweiterleitung
DE3209967C2 (de) * 1982-03-18 1986-07-10 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für Fernmeldevermittlungsanlagen, insbesondere Fernsprechvermittlungsanlagen, mit zentralen und peripheren Steuerungen
DE3211750A1 (de) * 1982-03-30 1983-10-13 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung fuer zeitmultiplex-fernmeldevermittlungsanlagen, insbesondere pcm-fernsprechvermittlungsanlagen, mit anschlusseinrichtungen fuer teilnehmerleitungen
DE3575830D1 (de) * 1984-04-25 1990-03-08 Siemens Ag Schaltungsanordnung fuer fernmeldevermittlungsanlagen, insbesondere fernsprechvermittlungsanlagen, mit einer pruefeinrichtung fuer schalteinrichtungen unterschiedlicher arten.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1910974A1 (de) * 1969-03-04 1970-09-17 Siemens Ag Verfahren zur UEbertragung von Schaltkennzeichen in einer PCM-Zeitmultiplex-Vermittlungsstelle,insbesondere -Fernsprechvermittlungsstelle
EP0006132A1 (fr) * 1978-06-14 1980-01-09 Siemens Aktiengesellschaft Système de commutation à commande indirecte avec joncteurs à division temporelle couplés à travers des étages de commutation temporelle, en particulier système de commutation téléphonique
DE2907867A1 (de) * 1979-03-01 1980-09-18 Telefonbau & Normalzeit Gmbh Pcm-vermittlungsanlage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1040833A (en) * 1965-02-19 1966-09-01 Standard Telephones Cables Ltd Improvements in or relating to telephone signalling systems
DE3100811A1 (de) * 1981-01-13 1982-08-12 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung fuer fernmeldevermittlungsanlagen, insbesondere pcm-fernsprechvermittlungsanlagen, mit einer zeitmultiplexkoppelanordnung mit zeitlagenvielfachen
DE3104002C2 (de) * 1981-02-05 1984-01-26 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für Fernmeldevermittlungsanlagen, insbesondere PCM-Fernsprechvermittlungsanlagen, mit einer Zeitmultiplexkoppelanordnung mit Zeitlagenvielfachen
DE3106879C2 (de) * 1981-02-24 1988-11-10 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für Zeitmultiplex-Fernmeldevermittlungsanlagen, insbesondere PCM-Fernsprechvermittlungsanlagen, mit Datenwegen zwischen einem zentralen Steuerwerk und dezentralen Steuereinrichtungen
DE3106903C2 (de) * 1981-02-24 1983-10-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung für Zeitmultiplex-Fernmeldevermittlungsanlagen, insbesondere PCM-Fernsprechvermittlungsanlagen, mit Datenwegen zwischen einem zentralen Steuerwerk und dezentralen Steuereinrichtungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1910974A1 (de) * 1969-03-04 1970-09-17 Siemens Ag Verfahren zur UEbertragung von Schaltkennzeichen in einer PCM-Zeitmultiplex-Vermittlungsstelle,insbesondere -Fernsprechvermittlungsstelle
EP0006132A1 (fr) * 1978-06-14 1980-01-09 Siemens Aktiengesellschaft Système de commutation à commande indirecte avec joncteurs à division temporelle couplés à travers des étages de commutation temporelle, en particulier système de commutation téléphonique
DE2907867A1 (de) * 1979-03-01 1980-09-18 Telefonbau & Normalzeit Gmbh Pcm-vermittlungsanlage

Also Published As

Publication number Publication date
BR8203248A (pt) 1983-05-24
JPS57211897A (en) 1982-12-25
ATE13238T1 (de) 1985-05-15
DE3122172C2 (fr) 1989-06-22
EP0066654B1 (fr) 1985-05-08
DE3122172A1 (de) 1983-01-05
AR230913A1 (es) 1984-07-31
JPH0113800B2 (fr) 1989-03-08

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